Pneumatic tire



Sept. 4, 1923.

R. B. DISBROW PNEUMATIG TIRE Filed Sept. 30 1922 Patented Sept. 4, 1923.

ETA

REUBENvB.`DISBROW, OF'OWATONNA, IMINNESOTA, ASSIGNOR OF OE-HALF TO L. I?.

ORDWAY, 0F ST. PAUL, MNNESOTA.

PNEUMATIC TIRE.

i Application filed September 3G, 1922. Serial No. 591,651. Y

To all whom t may concern.'

Be it known Vthat I, REUBEN B. DrsBRoW, a citizen of the United States, residing at Owatonna, in the county vof Steele and State of Minnesota, have invented certain new and useful Improvements in Pneumatic Tires; andl do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention provides a highly import-V ant improvement in pneumatic tires and is in the nature of a combined non-leak casing and air tube incorporated as a single tube structure. Between the outer or tread layer and the lining or Vinner layer 1s .a puncture-sealing substance composed 1n whole or in part of raw or uncured rubber. The lining or inner layer is of tough flexible rubber, such as used in making inner tubes, and, in fact, takes the place of the inner tube and forms the lining or inner surface of the single tube structure. To increase the puncture-sealing feature of the tire, an intermediate layer of tough rubber, much like the lining but of greater cross-section, is extended through the raw or uncured rubber layer so that the latter will be both on the inner and outer surfaces thereof. The outer 'or tread layer will preferably be built up of rubber and canvas or cords, much like an outer casing.

A preferred form of the improved tire is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout the several views.

Referring to the drawings:

VFigfl is a side elevation of the tire; Vand F ig. 2 is an enlarged transverse section taken on the line 2 2 of Fig. l andshowing the tire applied in working position to an ordinary demountable rim. I

In Fig. 2, the numeral 3 indicates an automobile rim and the numerals 4 and 5 indicate, respectively, vthe demountable body and the detachable flange of said rim.

In side and top or edge elevations, the improved tire has the appearance of an ordinary pneumatic tire and it may, of course, be made of Yany suitable design. Its outer or tread layer is indicated by the numeral 6. This tread layer, at the rimimproved 4the interior of the outer layer 6 engagingl po-rtion, has the usual-,flange-engaging vbeads 7, but these beads are not separated, as in the customary tire casing, but areconnected by a cylindrical web 8 that .rests directly against tliebody 4 of the` wheel rim.

The tough rubberI inner layer 9 of the tire forms a complete endless tube or lining to the complete tire and is spaced from the interior of the outer layer 6. The space between the exterior of the lining 9 and 1s as already indicated, filled in with raw,l or uncured rubber l0. The soft uncured rubber layer l0 has an eccentric cross-section and is thickest Iat its outer portion, and the same is true of the outer layer 6. The soft rubber layer l0 is divided into inner and outer4 portions by an interposed tough rubber Vtube 1l that performs anrimportant function, partly already noted but to be hereinafter more fully set forth. This intermediate tough rubber layer l1, as shown, is a complete tube but,'in some instances, would not be extended completely around the inner portion of the tire.

With the tire struct-ure described, if a nail or the like should be forced completely through'the tire, it would have to pass through both layers of uncured rubber and through both of the tough rubber tubes 9 and 1l. While such nail remains in the tire, there could be noleakage of air because the soft uncured rubber would tightly close the joint between kthe nail and the puncture. When the nail is removed, the soft uncured rubber, partly by adhesion to the nail and partly because of' internal pressure, will follow the nail into the puncture, completely filling the same and sealing the puncture. The sealing of the puncture is produced by internal pressure and an outward flow of uncured rubber radially outward or away from the lining tube 9, so that'it does not do to rely much on closing of punctures in said tube 9. However, the puncture will be sealed first by a flow of the uncured rubber into the puncture of the intermediate tube 11 and, second, by a flow of the uncured rub- Y ber into the outer tread layer 6, andthus, a double seal of the puncture is produced entirely by automatic action. Of course,'the larger .the number of layers of uncured rubber andtough rubber layers, or the like,

the more securely will the puncture be sealed. In actual practice, I have rfound that With a single intermediate tough rubber layer ifnterposed in the raw or uncured rubber, there Will not, under any extreme conditions that have been produced by various large nail punctures and the like, be any leakage of air from the tire because of the punctures.

The tire shown is provided With the customary air-charging valve stem @equipped with a dust cap 13. The soft or uncured rubber layers act as a cement or binder to hold together but to space apart the tubular elements 6, 9 and 1l of the complete single tube tire structure.

N ot only is the tire made a non-leak tire,

but its mileage is greatly increased and the y liability of blow-outs, during any reasonably long usage, is practically eliminated. The soft rubber layers prevent pinching and cranking of the sides of the outer or tread section or layer and, moreover, the complete tire is made very flexible, which is 'a good security against damage to the fabric or cords incorporated, in the outer tread section.

The very great inconvenience and resulting loss in time and money due to delays incurred fromvtire punctures is too Well understood to require any extendedcomment. My

gether, `giving increased resistance to the ti're and operating to seal punctures, the-circumferential air passage in said lining being continuous and said casing completely surrounding and enclosing said lining and -int'erposed layer.

In testimony'whereof I affix my signature,

REUBEN B. nisnnow 

